Working capital: the money that covers the gap between paying and getting paid
Every company has an interval between the day it pays its supplier and the day its customer pays it. That interval is the cash cycle, and someone has to finance it: the partner, the supplier or the bank. Working capital is credit to finance that interval. It usually comes in a short term and a revolving format, with or without collateral. If it comes "clean", with no real collateral, the bank charges more because, in case of default, it has nowhere to turn other than a lawsuit, and that is built into the rate. It is the easiest line to take out and the easiest to use wrongly, because it doesn't force anyone to explain where the money went.
Receivables advance: you aren't borrowing money, you're getting your own money early
Here no new money enters your capital structure: you swap a 60-day receivable for cash today, at a discount. The cost is the discount rate applied over the remaining term, and it exists even when nobody calls it interest. Two details change everything. First, recourse (coobrigação): in a good share of trade bill (duplicata) discount operations the contract provides for recourse, meaning that if your customer doesn't pay, you do. The credit risk of the debtor stays in your lap. This is not automatic: it is written in the contract, and that is where we check it. Second, the habit: advancing once to take advantage of a supplier discount is management; advancing every month to cover payroll means your margin is financing the bank, not the company.
Credit secured by property (home equity): why the cost tends to fall
In credit secured by property, the asset goes under a fiduciary lien (alienação fiduciária): title stays conditionally in the lender's name until you pay it off. The procedure to enforce this collateral is faster than a court process and, from the bank's point of view, the expected loss in case of default tends to be lower. That is why this line usually comes with a lower spread and a longer term than an unsecured line. It is not a rule: price and term are still set by the bank, case by case. You are not being rewarded for being a good payer; you are trading risk for price. Two practical consequences: the process is slow (appraisal, legal review, notary, registration), so it doesn't work for an emergency; and the property usually belongs to the partner as an individual, which puts the family's assets inside the risk of the operation.
Tailor-made credit: when the operation is designed, not picked from a menu
Structured doesn't mean sophisticated for sport. It means the debt's cash flow was designed to fit the business's cash flow: a grace period that respects the harvest or the construction schedule, a term that follows the asset's return, assignment of receivables from a specific contract as collateral (cessão fiduciária), real collateral, clauses and covenants (obligations you commit to meet, such as keeping a level of indebtedness, under penalty of early maturity). The gain is fit. The price is complexity: it costs more to set up, takes longer, and the contract starts to dictate your decisions for years. It makes sense when the amount and the term justify the work. It doesn't to cover a bad month.